Level



, L. E. coRYELL LEVEL Filed sept. 22, `1926 'and Patented `luly 5, 1927. l

' UNITED :STATE S1 Lnwisn. COR'YELL, or PORTLAND', OREGON.

LEVEL.

Application led September 22, 1926. Serial No. 136,935.

This invention relates generally to levelsv such as are usedby mechanics, and particu" larly to a special form of hand. level wherein the leveling element is self-adjusting, by means of which extremev accuracy can be obtained by even the unexperienced user.

The irst object of` this invention is to provide an exceedingly simple and efficient hand level in which levels are taken or read by aV sighting; action instead of by the position of a bubble, as is ordinarilyV the case.

The secondobject is to so construct the level'that it can be pivotally mounted on a support and swung around in a horizontal "plane for the purpose of establishing a number oflevels outside of a given plane. s

They third object is to provide a mounting for-the level which can be fastened on an ordinary stakeby means of a hammer and nail, and in which no injury can be caused to the level when-mounting same, due to the fact that the level and its mounting must be separated during the operation.

-The fourth object isfto provide a hand level having all of the characteristics ofA the ordinary hand level such as leveling and ,plumbing by means of the ordinary bubble action, as well `as other properties not possessed by the ordinary hand level.

These, and other' objects, will become more apparent from the specification following as illustrated in the accompanying drawing, in which: Y

Figure 1-is a side elevation of the level of which Figure 2 is an elevation showing the front half of the level removed to disclose the level tube. Figure 3 is a plan of the level showing same mounted on a stake.

Figure 4 is `an end elevation of the level of which Figure 5 is a fragmentary side elevation taken near one end thereof. Figure 6 is a vertical transverse section taken along the line 6-6 in Figure 7. Figure 7. is a fragmentary side elevation of the level having one end broken away to disclose the interior at an enlarged scale, and also show# ing the relation of the level and its mounting. Figure 8 is a` plan of the level mounting showing the outlines of the level in 'dotted line.

Similar numbers of reference refer to similar parts throughout the several views. v Referring in detail to the drawing, the

- level itself consists of ltwo longitudinal frame members comprised of the upper and lower straight edges k10 and lland a joiningv web 12. The two sections are' joined together by means of screws 18, which may be further supported by means of dowels if desired. When the. two members are united thereexists a space between theA members 12 The openingsV 14 provide an un what rectangular closed glass tube 16A con taining a suflicient amount of colored liquid (preferably alcohol) 17 so that when the edgeslO and 11 are exactly level that the surface of the liquid 17in the upright portions 18 of the tube 16 will register with the level marks 19 formed in the middle of the vertical height of the ends 15.`

It is preferable to provide'felt or other resilient pads 20 at intervals along the glas.c tube 16 to prevent breaking under rougli usage. v Y

A sheet metall base 21 is used, as a mounts ingfor the'level on a stake 22, or other suitable support, with inturned edges 23 which engage the sides ofthe level. lt is preferable to provide the member 21 with raised portions 24 to insure clearance for vthe head of the nail 25. Y

Openings 26 are provided on opposite sides and at each end ofthe level in the members 12 to facilitate the reading thereof from the sides of the level, as well as from the ends. v

It is also preferable to provide a slot 27 in the member 21 to enable the: user to drive the mounting olf of the stake without withdrawing the nail 25. A plumbing bubblek 28 is also mounted on the side of one of the webs 12in order to enable the level to be used as a plumb.

Since it will be somewhat diiicult to see through the rounded portion 18 of the glass tube it may in some instances be preferable to Hatten same, which can readily be done without departing from the spirit of this invention. In operation if itis desired to establish a. line of levels this device is set up by driving a nail through the slot 27 of the member 21 into a stake 22, or other suitable support, and then slipping the level firmly into place on the mounting 21. Vhether or not the level is lplaced in an exactly horizontal position, either longitudinally or 75 level.

transversely, is unimportant :is the liquid 17 in `the opposile nien'ihers lll will eoustnnlly find n eonnnon leveh ueross which the user sights with his eve lo the object being leveled, or to :i l'nezisuring; rod plneed thereon, which gives hiiu the uetiuil distance :ihove or below his dniiuni pinne. fill he need do is to mount the level nezir enough to the horizontal so that the liquid will show in the end Xlnsses. liltiug' or eenling ol the level will .not in unjv way ulleet the ueeur- :rey el the readingl linken thereon; in lnelny it need noiv lie level :it ull, in the sense re ferred to when speaking el? l'he ordiiuiry tripod level. in whieh euse it is equally iniportnnt to lli-et level the instrument in per pendieulnr vertienl plaines.

l it is desired te dispense with the sighting action, us for u short object or for places where it would net he prnel'ieui lo sight, the level is nierolv plneed on the object, ns would he the ordinzinv hund level, und the relation between the sulinee of the liquid li' :rnd the inurl; il) :il one or both ends of the level is noted.

It ezln he seen that h v this eonslruirtion it is pos ble to Seeure the suine :ieuiruey that eould he obtained only frein n hund level having n huhlile lnuny tunes its present length.

Another ndvenl'ege in this deviee arises l`ro1n the Ainet that it ennnot get out o l-I luljuslinent, even il the liquid containing` lulie should heroine entirely iliuplni'ed within the This will not ulieet the relation hetween the liquids in the opposite ends ol (he level und it is upon these relative relulions tlm t thi ueeurziey el this lool deijiender.

While there is illusl'rziled one forni ol mount-inn' 2l il'or the purpoere ol holdingl the leveh it elezir that n gre-:il niunv ehungei: ning he nnide in this und other details wilh-4 out departing! :lroni the spirit oi ihis nvenlion.

l ein nwnre ihut niuny ilili'i-frent lorins ol hund levels halve heen eoiufitrueted in the peut; l lliereljire do not inleuil lo over euch deviees hroiullv, hut l do intend lo rover :ill sueh ilornis und uiodifieulions there-- ol :in `liill 'l'uirly within the uppended elniin.

l eluiin:

il .level having, in eonihinulien, :i long-itudinzil split lrzinie having;v u groove lornieil between the parte thereof, sind groove hilvingl the side portions of eneh end lhereol' purtizillv closed; :i lrnnspiirent closed tuhe ineinher, the ein" ol whirh nre closed to sind partially cloned 'l'rziuie ends, seid l'rimsirini'- ent tuhe nienilier having;v u eolored liquid therein sullieienl to entend :ipproxinmtely uiidwuy in the ende el seid reeli'iugnihir l'rnine when liorizonlully pinned in :i vertieul plone: und menne 'or iiivoi'ully mounting; fluid level on :i lined support, uuid ineens eonsieliing elf :i onse havingt :i V slot loi'ined in the hijitloni thereof ilor enn'nning the under ,side ol' u unil-heed. Suid hase huvingi upvurdly und inwardly turned sides adepteil lo sliduhly engage the lower ednie olf seid straight edge. 

